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One species (B. manni); 12-segmented antennae. Small nests in forest floor leaf litter, in lowland wet forest; moderately common but very cryptic.
Habitus relatively uniform; species differing mainly in size, sculpture, pilosity. Mandibles subtriangular. The two genera differ only in Eurhopalothrix having 7 antennal segments, and Octostruma having 8. Antennal segments can be very difficult to count, so if uncertain try both keys. They are cryptic ants in leaf litter; common but infrequently seen.
Three Costa Rican species; uniform habitus; 7-segmented antennae; mandibles elongate with apical fork (contrast with triangular mandibles of Eurhopalothrix, Octostruma). Cryptic ants of forest leaf litter; rare.
John T. Longino, The Evergreen State College, Olympia WA 98505 USA. firstname.lastname@example.org